He is Animal Planet's "Herpetologist" on the extremely biased show "Fatal Attractions"
This is kind of an old topic, but I've been reading up about him, and had mixed feeling until I read this.

http://www.capefearserpentarium.com/DannySteele.pdf

Has anyone heard anything else about him, on both good and bad sides?

I can't really judge him because I don't know if this story is 100% true, but it's pretty convincing that this guy is a nut.